Taylor Swift was in '13 Reasons Why'

Last week, Selena Gomez released her music video for "Bad Liar" and a perceptive fan noticed that Taylor Swift made a cameo in it. It looks like Selena has a habit of asking her friend to make cameo's, because she was also in the show 13RW.

And it happened in the blink of an eye.

Tumblr user notes that Tay makes a brief appearance in Episode 10 of the series.

Tyler is talking to Sheri in the hallway of Liberty High, and there is a poster in the background.

If you pay close attention, you'll see that it's Taylor's album, 1989.